We have found an issue when attempting to play split screen in an on-line world where the game requires the second account to log in multiple times and will then duplicate the second gamer tag (I.e. JohnSmith will also be signed in as JohnSmith(1)) instead of the actual online gamer tag. Then when in the game it continues to ask to join a 3rd player and accidentally creates a third phantom player that player two has control of. Two screens or players move at the same time in different locations.